package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Service
public class ShoppingCartImpl implements ShoppingCartService {

    @Autowired
    private ShoppingCartMapper shoppingCartMapper;

    @Autowired
    private DishMapper dishMapper;

    @Autowired
    private SetmealMapper setmealMapper;
    /**用户添购加物车
     *
     * @param shoppingCartDTO
     */
    @Override
    public void addShoppingCart(ShoppingCartDTO shoppingCartDTO) {

        //判断当前加入到购物车的商品是否已经存 在
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        Long userId = BaseContext.getCurrentId();
        shoppingCart.setUserId(userId);

        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        //存在，将数量+1
        if(list != null && list.size()>0){
            //取出唯一的一条数据
            ShoppingCart cart = list.get(0);
            cart.setNumber(cart.getNumber() + 1);
            shoppingCartMapper.updateNumberById(cart);
        }

        //不存在， 数据插入到购物车中
        else {

            //判断本次添加的是菜品还是套餐
            Long dishId = shoppingCartDTO.getDishId();


            if (dishId != null ){
                //本次添加的是菜品
                Dish dish = dishMapper.getById(dishId);
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());

            }
            else {
                //本次添加的是套餐
                Long setmealId = shoppingCartDTO.getSetmealId();
                Setmeal setmeal = setmealMapper.getById(setmealId);
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setAmount(setmeal.getPrice());
            }

            //统一设置数量 1  时间是当前时间。
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            //统一插入到数据库中
            shoppingCartMapper.inser(shoppingCart);


        }

    }

    /**查看购物车
     *
     * @return
     */

    @Override
    public List<ShoppingCart> getShoppingCart() {
        Long userId = BaseContext.getCurrentId();
        ShoppingCart shoppingCart = ShoppingCart.builder()
                .userId(userId)
                .build();
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        return list;
    }

    /**清空购物车
     *
     */

    @Override
    public void cleanShoppingCart() {
        Long userId = BaseContext.getCurrentId();
        shoppingCartMapper.clean(userId);
    }

    /**更新购物车中的一个商品的数量
     *
     * @param shoppingCartDTO
     */
    @Override
    public void subOne(ShoppingCartDTO shoppingCartDTO) {

        Long userId = BaseContext.getCurrentId();
        ShoppingCart shoppingCart = ShoppingCart.builder()
                .userId(userId)
                .dishId(shoppingCartDTO.getDishId())
                .setmealId(shoppingCartDTO.getSetmealId())
                .dishFlavor(shoppingCartDTO.getDishFlavor())
                .build();
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        ShoppingCart shoppingCart1 = list.get(0);
        shoppingCart1.setNumber(shoppingCart1.getNumber() - 1);

        //当购物车中的菜品减到0时删除
        if (shoppingCart1.getNumber()<=0){
            shoppingCartMapper.delete(shoppingCart1);
        }

        //更新数量
        shoppingCartMapper.updateNumberById(shoppingCart1);

    }
}
